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What is the fuel tank capacity of a semi truck?

The fuel tank capacity of a semi truck can vary depending on the size and type of truck. In general, semi trucks have fuel tanks that can hold between 100 and 400 gallons of diesel fuel. Some semi trucks even have additional fuel tanks, called auxiliary tanks, which can increase the total fuel capacity to over 700 gallons. Smaller single-axle dump trucks that may operate exclusively at a construction site have a much smaller capacity as a general rule-often under 50 gallons. The size of the fuel tank is important because it determines how far the truck can travel on a single tank of fuel.